Short-circuiting switch



Feb. 5, 1929.'n

L. B. FRIE 'ET AL 4sHfiRT CIRCUITING' swITcH Filed Feb. 2, 19218 Inventors L. B. Fro

L;L"Gr. Bergmann :T: By

v l l l u 7 Atty.

cuiting rod.

Patented Feb. 5, i929,

girare LINDSAY B. rain .ann` E Livrnn e. iai-incrementen sr. Louis, M'issonnr.

snonrcrncnrrine svi/irren.

Application filed February 2, 1928. Serial No. 251,262.

ject of our invention is to so construct the switch that it will be completely waterproof.

ln the accompanying drawings which illustrate one forni of switch made in accordance with our invention,'Figure 1 is a vertical central section; Figure 2 is an enlarged section of one of the inlet connections; Figure 3 is a detached view of the short-circuiting rod;v

Figure 4 is a top plan view; and Figure 5 is a diagrammatic vi ew showing the switch in connection with a set'of transformers which it is adapted to short circuit.

The casing 1, which is circular in cross section and preferably taperedlongitudinally, may be of cast iron or other suitable material formed in the lower end of the casing is a threaded opening to receive a threaded plug 2, preferably of brass, which isY slightly tapered to yform an oil tight joint. Carried by the plug 2 is a downwardly projecting stein 3 adapted toY be connectedwith the grooved wire and Van upwardly eX- tending stem 4 provided with an opening to receive the lower end of the short-cir-A Secured to the upper end of the .asing by bolts 5 is a cover plate 6 having` interposed between it andthe casing an insulating block 7. Formed in the cover plate is an opening surrounded by a threaded iiange 8 tocngage a screw cap 9. Surrounding the stein 4 is the lower end of a perforated tube 10. This tube is formed of material suoli as mica composition, which not only serves as an Y electrical insulation but is also heat resisting.

The upper end of the tube surrounds a steml 11 having an enlargement or head 12 set into the insulating block '7. Extending through the stem 11 and head .12 is a bore 22 for the passage of the short-circuiting rod andf-the insulating block 7 also has an aligning opening for this purpose. in the head at dia metrically opposite sides are openings to receive the inlet and outlet supply wires 13 which are secured in position by set screws 14.l

In oi'der to hold the wire sockets in alignment the head is inade square, as shown, or of other non-circular form. Formed on opposite Isides of the casing are nipples 15 extending thinibles 17 of the line wire.

downwardly at an angle and adapted to be connected byv union nuts 16 with the terminal changed. In Figure 2 .we have shown theV line leading from the head 12 provided with a socket 19' and the main line'p'i'fvith a split plugs/20. in the connection at the op" posite sidetliese parts will be reversed, the socket beingo'n the main line and the plug on the wire leadingto the head. The short-circuit-ing rod 21, of copper or other go-od con-4 ducting material, is of the proper diameter to i'it snugly in the bore 22 and thefopening in the stein 4. lt is .provided with an insulating handle 23 by means of which it may be inserted, after removal of the screw cap 9, as shown in dotted lines in Figure 1 to connect the line wire with a ground wire 24 connected to the stem 3. i` f It will be evident that whileour switch is of the simplestconstruction it isconipletely waterproof and easy of use. Further, while the construction is such that the parts are not likely to be injured in use it is possible, in

vcase suchy injury does occur, to remove and replace any of the pai-ts easily. o

Having described our invention, what we claim` as new and desire to secure by Letters Patent of the United States is:

1. In a device of the class described, the combination with a casing adapted to contain oil, of a conduct-ing stein carried in the lower end of said casing, a perforated tube of insulating material surrounding said stein, an insulating cover for said casing, a contact block engaging with said tube and held against said cover thereby, a pair of lateral inlets carrying line wires connected to said block7 and a short-circuiting rod adapted to connect said contact block and stem. f

2. In a device of the class described, the combination with a casing adapted to contain oil, of a vscrewthr-eaded plug in the lower end of said casing provided with a conducting stein, a perforated tube of insulating Vlng cover for said casing provided in its In the nipplesA so.l

material surrounding said stein, an insulat- 2 c' p n f 1,700,836

loWer face with a recess, a contact-block held in said recess by sa-id tube, and av shortecir- @uiting` red adapted to pass through said contact block and engage with said stem,

3. In a device of the class described, the combination With a adapted to contain oil, of afscreW threaded plugin the lower end of said casing proviced 'with a combination with a casing adapted to con' Vconducting stem, a perforated tube of insu;

latin@ material surroundino said stein an insulating cover for said easing provided in its lower face with a recess, a Contact block held in said recess by said tube, a short-circuiting' rod adapted to pass through said contact bleek and engage with said stein, and a removable cap to cover the end of said rod.

L In a device of the class described,- the combination With acasing adapted to con tain oil, of a screw threaded plug in the lower end ofsaidf casing. provided with aconducting stem, aperforated tube ot insulating material surrounding said stein, an insulat-` inof cover for said casino' rovided in its` lower face with a recess, a contact block held Vin said recess by said tube, a short-circuitii'ig rod Vadapted to pass through said Contact bloei; and engage With said: stem, a cov'er plate over said insulatingcever, and a screw' cap carried by said insulating plate to cover theend of said rod, A f Y 5. Ina ydevice oi' the' class described, the

tainv oil and provided with lateral nipples, a Contact member in the lower end ot said casing, a second contact member in the upper part of said casing', av perforated insulating tube extending betweenv said Contact members, ashort-circuiting; rod extending through said tube and connecting' said contact members, line Wires passing through said nipples and connected to said upper con tact member, and insulatingtubes carried by said nipples, said tube surrounding said line sulating" tubes carried by saidA nipples, said tubes surroundin@- said line Wires and terfy ii'iinating adjaceiit to said upper Contact member, t Y

7.*ln a device of the class desci'ib'ed,the combination with a casing adapted to con tain oil and provided With downwardly in clined lateralnipples, oa.screw threaded plug in the lower end of casing' provided With a' Condiictin,` stein, a perforated insu#V lating tube surrounding` said stem, an insu lating cover for said casing provided in its lower face with a recess, a Contact block held in said recess by said tube, a shr'irt-circuitine: v rod extending through 'said tube and connect- Y ing saidcontact block and stenna cover plate over said insulating' cover, a screw cap carried by said cover plate to coi-1er the end said rod,- line Wires passing,v 'through said nipples and connected to said coi-atact block, and upwardly extending` insulating tubes carried by said nipples, said tubes surround; ing-'said line Wires and terminating adjacent to said contact block..

ln testimony Whereo'vve hereunto aiiiX our signatures, this 31st day of January,

ieee.

LiNnsaY ERIE'.- iiLi/inn e. BERGMANN. 

